I want to install on my mac but bootcamp doesn't select "install windows 7 or later" option, can anyone help me how to install it ?

Did you modify Bootcamp info.plist? What year/model is your Mac?

1. Is this the first attempt at installing Windows, or has it failed in the past?

2. Can you run the following two procedures and test?

How to Reset NVRAM on your Mac - Apple Support

Resetting the System Management Controller (SMC) on your Mac - Apple Support

Please ensure that you meet Requirements for Software Update Service - Apple Support .

If you used bootcamp to create a partition before for one of your other attempts it is possible that either the creation or destruction of a prior bootcamp partition resulted in a broken partition. I recently had that third option greyed out for me and discovered it was because it had failed to create a new BOOTCAMP partition correctly and the 30GB of space magically disappeared and there was no drive assignment to the partition. I had to back-up my Mac HD with time machine, create a USB bootable drive of Yosemite, and completely re-format the entire drive and re-install my OS and files for it to come back. I would recommend using Disk Utility to see if a portion of your HD space is missing. For instance, I had a 250GB drive and my Mac HD partition showed up as having 220GB but there was no other partition (not even a free space one) explaining the whereabouts of the missing 30GB of data storage. The missing 30GB didn't show up until I used Disk Utility from a Yosemite boot disk and when it did it was labeled as Free space that I could not bring back into the primary partition. I had to re-partition and re-format the drive into HFS+.

Do you have any third-party NTFS software?